09.18: A wire has a conventional currxxrr x8i2ql/xj +b:)vj5 kwp7/ld ;nv ent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on th pnrx5)lkjw28vlxb+ ;q/7dxrj /ix:v e electron at this instant is

  14.24: For the bar magnet shown in the figure, which choic 1fs*rradnl9t7g;00ea8 myo qe best describes the direction of the magnetic field at the point P located directly above the*tm7aa9d0l srrog0;1f8y neq center of the magnet?

  11.34: A wire lies in the plane of the page with conventional curdj cx(6s) byll129tjjubd ;3yrent I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right towaly2(ujs x1y96c jl3b )dtd; bjrd the wire?

  13.30: Electrons flow to the left in )v wj25q7p 64bi uidcca wire as shown. For the proton moving toward the top of the page at the instant shown, what is the di2u4w b7vcip56 ij )dcqrection of the magnetic force on the proton?

  94.30: The conventional current I in an/gxmiun- +.h long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, thn+xh ig-n/m .ue force on the proton is:

  95.16: A charged particle with consts8mcv 8 rq+ u*8dsu4kfant speed enters a uniform magnetic field whose88 c4mq vuf8k+* susdr direction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with coe*j8 ; cb2qrvpnstant velocity enters a uniform magnetic field whose direction is parallel to the particle’s veloci e8 v*crbpjq;2ty. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- kdwvm fqz -fv3sff08:6efu 07 zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about the magnitude of the elec ff3 f8u76-fsvdfqwkm e0:0z vtric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with c;zliiey + vcks:450a lonstant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page0ky+:i alesz c4;ivl 5. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligi0d zfs07an j5 -hcxfi1ble weight is released from rest between the poles of a horseshoe masinzdh a5cx 70f0-1fjgnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving i uszk ,h5jz55t0f 1unxn the plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown.5z1,njk550uxzsuf th At the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spee/r; tsxbj;c,kd $1.00× 10^3\: m/s$ as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of $8.00× 10^5\: m/s^2$ for the entire time of $1.00× 10^{−3}s $ that it is in the field. With what speed would the electron exit the field? Ignore gravity.

  14.29 An electron with charge −e and mass m travels at a speed v im o(u 2i p z:qqm5/gvhw)/i1rzn a plane perpendicular to a magnetic field of magnitude B. The electron follows a circul(v ium/ rphqoz2gi 51q/mwz:)ar path of radius R. In a time t, the electron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic field Baw4 kezx 5e8rj9. dc+z and is deflected into a path with a cwjze4+edr9xz.85 ka radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. An( pg0mg/r /xf hdr0bws-pr ,6 helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic f6/gxg rp0-0w/brps h(rdn m ,force during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpenm9 c k.dkikwsg79n7cp +g:y 1fdicular to the same uniform magnetic field. The ions carry the same charge and have 9m97c:ic 7gd1 +y.nkgkskfw pthe same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle mog 4aqigm):1u9b 6.lnfdyi z6vves to the right. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a 1)6mliu g i6.dv n f:bqa9gy4zmagnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic e-fif);ngs 9 uoe d1z1isp8/k rnergy $E_k$ passes undeflected through a region with electric
and magnetic fields perpendicular to each other. The electric field has magnitude E. The magnitude
of the magnetic field B is:

  04.25: The speed of electrically charged beta particles is commonlyd59 j.4 ks:t6muccvvmdi7l,6q8vr bc determined bm.,bcskjc4 6u6vv 79m q5dlv 8: tidrcy

  09.27: A proton moves straight up the plane of this page into ama*wpy +q8.ad 3dxlj h-fh 5a2 region that has a magnetic field directed to the right. If the particle is undeflected aswdd*amaq2+ ay3lh . f-jpxh5 8 it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regi lnd9 e+t;djo:ons of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of the page (as shown). There is no electric field in Region II. What is a necessary direction of the magnetic fieldedtn : jo+l;d9 in regions I and II?
Ignore gravitational forces.

  12.36: A positive charbvh 6hc unkll :2c3o;;w1ay;rge moves with constant velocity through a region of space containing both kh1 3c ul :yobn2w;cl;r h;a6van
electric field and a magnetic field. The electric field is directed out of the plane of the page.
Ignoring any gravitational field, which one of the following choices represents possible directions
of both the particle’s velocity and the total magnetic field in the region of space?

  15.29: An electron moves at constant non-zero velo*g u uk2j lzt-1j(g2rycity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the cu t kulzjgrg*(u-21y2 jrrents are in opposite directions as shown in the figure. Ignoring gravity, which choice best reflects the direction of the magnetic field and the direction of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.